What Marstrom Composite does

Marstrom Composite AB is a Swedish full-service manufacturer of advanced carbon-fibre composite components, headquartered in Västervik and operating five production sites in Sweden with over 6,000 m² of lamination halls. Founded in 1983 by Olympic sailor Göran Marström, the company serves Tier 1 OEMs and prime contractors across defence, aerospace, automotive, marine, and industrial verticals, and is a wholly-owned subsidiary of Scandinavian Astor Group AB (NGM Main Market listed since December 2025). Its operating subsidiaries include Carbonia Composites (RTM serial production for automotive), ID Modeller (in-house mould and prototype manufacturing), and Composite Design Sweden.

Marstrom's manufacturing platform centres on autoclave-cured carbon-fibre prepreg (seven autoclaves up to 35 m long at 12 bar pressure), complemented by Resin Transfer Molding, vacuum infusion, and wet lamination, supported by full in-house CAD/CAM/CAE engineering and 5-axis CNC tooling. The company uses a proprietary one-shot spar manufacturing technique and has parts flying on Boeing 737/757 and Airbus A320 platforms — over 1,500 aircraft equipped — alongside ground, marine, and airborne defence systems. Named customers include BAE Systems, SAAB, Boeing, Airbus, Volvo, Porsche, Koenigsegg, Scania, Vestas, IKEA, Thule, Electrolux, Nibe, NKT, and Mycronic; the company holds ISO 9001 certification.

Revenue is generated through engineered-to-order composite component manufacturing sold via direct enterprise sales led by a sales director and supported by technical sales, project managers, and embedded engineers. Defence customers are served under multi-year framework agreements, including a SEK 100 million, five-year agreement signed in June 2026 with a Western defence industry actor. Aerospace revenue is driven by certified serial production and spare-part repairs, while automotive revenue flows through Carbonia as a Tier 1 supplier. Parent group Scandinavian Astor Group reported FY2025 net sales of SEK 433.2 million (+94% YoY) with an adjusted EBITDA margin of 19.2%, with Marstrom as the core subsidiary driving defence and composite revenue.

Name

Marstrom Composite

Legal name

Marstrom Composite AB

Website

https://marstrom.com

Company type

Private

Founded year

1983

Operating status

Operating

Headcount range

11–50 employees

Short description

Marstrom Composite AB is a Swedish full-service manufacturer of advanced carbon-fibre composite components for aerospace, defence, automotive, marine, and industrial customers, operating five production sites with one of Europe's largest autoclave footprints. Wholly-owned subsidiary of Scandinavian Astor Group.

Ownership category

akta.pro rank

Headquarters

HQ city

Västervik

HQ country

Sweden

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Technology or R&D, Supply Chain, Infrastructure, Marketing or Sales

Revenue model

1. Custom composite component manufacturing: Core revenue from engineered-to-order composite components, prototypes and serial production across aerospace, defence, marine, automotive and industrial sectors. Sourced from full value-chain offering (engineering, tooling, manufacturing, post-processing) for Tier 1 OEMs and prime contractors.
2. Multi-year defence framework agreements: Long-term framework contracts with defence industry customers providing defined multi-year revenue streams. Example: five-year framework agreement with a Western defence industry actor worth approximately SEK 100 million signed June 25, 2026.
3. Aerospace serial production: Volume serial production of composite parts for commercial aircraft (Boeing 737/757, Airbus A320) and rotorcraft/UAV platforms. Includes spare-part repairs on behalf of airlines and helicopter workshops.
4. Automotive Tier 1 supply: Tier 1 serial manufacturing of carbon and fiberglass components for leading European automotive OEMs through subsidiary Carbonia Composites (e.g., Koenigsegg bodies, Scania bus bodies, carbon-fiber wheels with Caran/Volvo).

Pricing tiers

Go-to-market motion3 records

Distribution channels4 records

Marketing channels6 records

Core offering

Marstrom Composite AB designs and manufactures advanced carbon fiber composite components using prepreg autoclave curing, Resin Transfer Molding (RTM), vacuum infusion, and wet lamination. Operating from five production sites in Sweden with in-house tooling, 7 autoclaves up to 35m and 12 bar pressure, and 5-axis CNC machining, the company delivers engineered-to-order composite parts and assemblies to aerospace, defence, automotive, marine, and industrial OEMs.

Product overview

Marstrom Composite AB is a single unified full-service composite manufacturing platform that brings together five specialist subsidiary brands under one operational roof: JPC Composite (technologically advanced composites for marine, industrial, aerospace and defence), Composite Design (development and production of composite components), ID Modeller (advanced mould and tool making using 3- and 5-axis CNC machines), and Carbonia Composites (high-volume RTM serial production for automotive). The offering spans the complete value chain from engineering and CAD/FEA development through tool and mould manufacturing (via ID Modeller) to four composite manufacturing methods (pre-preg autoclave curing, vacuum infusion, RTM, and wet lamination), and post-processing/assembly services — grouped under Defence and Civilian application areas that include carbon fibre spar building for marine clients, automotive serial production via Carbonia, and aerospace components flying on Boeing 737/757 and Airbus A320 aircraft.

Differentiator

Problem solved

Functional benefit

Brands

• Carbonia Composites: Technologically advanced composites using Resin Transfer Molding (RTM) for rational and cost-effective serial production of high-performance composite components; Tier 1 supplier to European automotive OEMs.
• Composite Design
• ID Modeller

Products and services

• Pre-preg Autoclave Manufacturing
• Resin Transfer Moulding (RTM)
• Vacuum Infusion
• Wet Lamination (Hand Lay-up)
• Engineering & Development
• Tool & Mould Manufacturing
• Post-Processing & Assembly
• Carbon Fibre Spar Building

Quantifiable outcome

• More than 1,500 aircraft (including Boeing 737/757 and Airbus A320) currently flying with Marstrom composite parts
• +5 more outcomes

Named customers23 records

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Eight partnerships are on record, tiered flagship parent / core, core subsidiary, core subsidiary (merged), strategic partner and minor.

• Scandinavian Astor Group (Astor Group)flagship parent / coreStrategic or Co-development PartnerMarstrom Composite AB is part of Astor Group, a Stockholm-listed group focused on security and defence. The group completed a merger of Marstrom Composite AB with JPC Composite AB in March 2026 to streamline operations and strengthen its position as a supplier to defence and civilian sectors. Marstrom benefits from Astor's defence strategy, capital, and the SEK 100M defence framework agreement signed by Marstrom in June 2026.
• ID Modeller ABcore subsidiaryStrategic or Co-development PartnerMarstrom acquired the assets of ID Modeller AB for SEK 12.75 million (announced Dec 2024), bringing advanced mould and prototype manufacturing in-house via 3- and 5-axis machines. Provides round-the-clock production of aluminium and high-density board moulds, fixtures, master models, patterns and vacuum forming tools — strengthening Marstrom's full-service composite offering.
• JPC Composite ABcore subsidiary (merged)Strategic or Co-development PartnerJPC Composite was a sister subsidiary within Astor Group delivering technologically advanced composites to marine, industrial, aerospace and defence customers. Announced October 2025 and completed March 2026, JPC was absorbed into Marstrom Composite AB to streamline the group structure and strengthen its defence/civilian supplier position.
• Composite Design Swedencore subsidiaryStrategic or Co-development PartnerComposite Design Sweden is a Marstrom specialist operation developing and producing composite components for civil and defence-related applications in marine, industry, aerospace and defence, accessed via composite-design-sweden.com.
• Carbonia Composites ABcore subsidiaryOEM/ Whitelabel/ Licensing PartnerCarbonia Composites is the Marstrom subsidiary operating Resin Transfer Molding (RTM) for rational, cost-effective serial production of high-performance composite components, including Tier 1 automotive supply (e.g., Koenigsegg full bodies, Scania bus bodies, Caran/Volvo carbon-fiber wheels). CEO Fredrik Lindblom also serves as CEO of Carbonia Composites AB.
• Xtenders (Dutch boatbuilder)strategic partnerStrategic or Co-development PartnerLong-term collaboration with Dutch boatbuilder Xtenders stemming from the VX40 catamaran and Volvo Ocean Race era (2005+); ongoing co-development of a lightweight, fuel-efficient RIB for race-team support and broader marine markets, leveraging Marstrom's one-shot hull technology.
• Local universities and community organisationsminorGTM or Marketing PartnerMarstrom has a long tradition of collaborating with local organizations and universities through its sponsorship programme, supporting initiatives that encourage innovation, craftsmanship and technical curiosity. Applications are reviewed once per year by management.
• 2Secure (whistleblowing service provider)minorImplementation/ SI/ Consulting PartnerExternal whistleblowing service provider that receives and handles reports via wb.2secure.se and the +46 77 177 99 77 phone line. Provides case officers, anonymous reporting infrastructure, and independent processing of whistleblower reports under Marstrom's ethics/whistleblowing committee oversight.

Scale indicators9 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• GKN Aerospace: A global Tier 1 supplier of aerostructures and composite components across commercial and military platforms. Highly comparable to Marstrom's aerospace composites work, but at vastly larger scale and across a much broader product portfolio.
• Hexcel: U.S.-listed supplier of carbon fibre reinforcements, prepregs and composite parts used in commercial aerospace, defence and industrial markets. Comparable to Marstrom as an autoclave/prepreg-based composites manufacturer serving Boeing/Airbus and defence primes.
• Toray Advanced Composites: Subsidiary of Toray Industries supplying thermoset and thermoplastic prepregs and parts for aerospace, defence and industrial applications. Closely comparable to Marstrom's autoclave prepreg heritage and aerospace customer base.
• RUAG Aerostructures: Swiss aerospace composites and aerostructures manufacturer serving European defence and commercial programs. Comparable as a European mid-sized autoclave-based composites supplier serving Tier 1 OEMs.
• Premium AEROTEC (Airbus): Airbus-owned manufacturer of composite and metallic aerostructures for commercial aircraft and military platforms. Comparable on autoclave-cured composite parts for Airbus platforms where Marstrom is also a qualified supplier.
• Triumph Group: U.S. aerospace structures and composite components supplier across commercial and military platforms. Comparable to Marstrom on engineered-to-order composite aerostructures and assemblies, but at substantially larger scale.
• Teijin Carbon: Japanese carbon fibre and composites manufacturer serving aerospace, defence, automotive and industrial markets. Comparable as a vertically integrated carbon fibre/prepreg-to-parts supplier with aerospace and automotive OEM qualifications.

Direct peers

• Gurit: Swiss-listed specialist in advanced composites, core materials and engineering for wind, marine, automotive and aerospace markets. Highly comparable to Marstrom as a vertically integrated composite engineering and parts manufacturer serving racing sailing, wind and aerospace customers.
• Saab Aeronautics: Swedish division of Saab AB manufacturing advanced military aircraft and aerostructures (e.g., Gripen). Comparable as a domestic Swedish aerospace/defence customer and composites-using peer that Marstrom supplies as a Tier 2.

Regional players

• Kongsberg Defence & Aerospace: Norwegian defence/aerospace systems and composites manufacturer. Comparable to Marstrom as a Nordic defence supplier using composites for naval, airborne and ground systems, with overlapping Scandinavian customer ecosystems.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/marstrom-composites-ab
• Xx.com/perwarn
• Facebookfacebook.com/Marstrom-Composite-159632827401559

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries3 records

Funding overview

Funding rounds2 records

Investors2 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A3 records

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Marstrom Composite